Enzyme tests for three further disorders not readily included in the above categories are available in the laboratory and are listed below.
| DISORDER | |
| Glycogen storage disease type IV (Andersen disease) | Glycogen Brancher Enzyme |
| X-linked ichthyosis | Steroid sulphatase and arylsulphatase C |
| Pyruvate carboxylase deficiency* | Pyruvate carboxylase |
| (* = prenatal diagnosis available) |